 It is only at the time of the Hundred Years' War that Harcourt became a military base.In 1418, the castle was claimed by the English, but they were eventually expelled by the counts of Dunois, Eu and Saint-Pol in 1449.As the war came to a close, the domain returned to the Rieux family, then, starting from the second half of the 16th century, to the powerful Lorraine-Guise family.